{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.682","julian_year":2026.682,"time":"2026-09-07T00:23:33.800Z","years_from_j2000":26.682,"frame":"date","applied":"Proper motion, then precession and nutation. The catalogued J2000 position is carried along the great circle the object's own published motion puts it on, at a constant velocity, and the result is referred to the true equator and equinox of this instant. Those are separate things: the motion moves the object, and the rotation turns the grid under it by about fifty arcseconds a year, with nutation adding up to another seventeen.","excluded":"Parallax, the radial-velocity perspective term, aberration and refraction; each is below the accuracy of the catalogued positions themselves. An object with no published proper motion comes back where the catalogue has it rather than at a fabricated zero, and says so with a null pm_ra_mas_yr. A body with no fixed position is not propagated at all — its place comes from an ephemeris, which is what /api/v1/visible answers with."},"slug":"wasp-181-b","name":"WASP-181 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1426.9178446918665,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":26.7932253,"dec_deg":3.1329325,"epoch_ra_deg":27.141136,"epoch_dec_deg":3.26728,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"WASP-181","semi_major_axis_km":8118676.442888999,"periapsis_km":null,"mass_kg":5.675420999126201e+26,"mass_msun":0.000285425,"constellation":"Pisces","discovered":"2019","featured":false,"url":"https://spacecatalog.org/object/wasp-181-b","radius_km":84646.6735136,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"WASP-181","host_v_mag":12.924,"uncertainties":{"mass_kg":[6.453655985628456e+25,6.453655985628456e+25],"radius_km":[4218.0352511,5075.9407259],"distance_ly":[25.0781638826404,25.97509392136145],"host_mass_solar":[0.04,0.04],"inclination_deg":[0.59,0.76],"host_radius_solar":[0.043,0.043],"host_temperature_k":[70,70],"semi_major_axis_km":[103222.53078299998,103222.53078299998],"orbital_period_days":[0.0000034,0.0000034]},"host_mass_solar":1.04,"inclination_deg":88.38,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.965,"planets_in_system":1,"discovery_facility":"SuperWASP","host_spectral_type":"G2","host_temperature_k":5839,"orbital_period_days":4.5195064,"transit_midpoint_bjd":2457747.66681,"equilibrium_temperature_k":1186},"designations":[{"catalog":"Exoplanet","designation":"WASP-181 b"},{"catalog":"Host star","designation":"WASP-181"}],"source":{"id":"exoplanet_archive","name":"NASA Exoplanet Archive (Planetary Systems Composite Parameters)","url":"https://exoplanetarchive.ipac.caltech.edu/cgi-bin/TblView/nph-tblView?app=ExoTbls&config=PSCompPars","license":"Public domain (NASA)"},"updated_at":"2026-09-02T19:50:56.720Z","attribution":"Data from SpaceCatalog.org. Individual records carry their source and license in `source`; attribution is required for CC-BY and CC-BY-SA rows."}